Panasonic Electric Works Nordic AB
MEW01351
Rev: -
Planning Instructions Fire alarm system EBL512 G3, V1.1.x
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1.8
0.1
3.1
Time
Sensor value
Obsc. in % / m
Sensor value (A)
Smoke puff
or disturbance
Smoke puff
or disturbance
Fire alarm level (C)
Week average
sensor value (B)
Constant
sensitivity
Service level (D)
Service signal
given
Fire alarm
offset 3.0 %
Figure 17. The basic working
principle
for an analog smoke
detector ("sensor"). Sensor value (A), Week average sensor
value (B), Fire alarm offset (3 %/m), Fire alarm level (C) and
Service level (D).
"Sensor Information" is available via menu H4/U4. Via WinG3 and a
PC connected to EBL512 G3 you can get "Sensor Information" for all
analog detectors on a COM loop or an individual detector. For an
individual detector you can also get continuous information:
Technical no. | Zone-Address | Min. | Max. | Momentary | Weekly | Performance factor.
Also via the Web-server II 1598 you can get "Sensor Information" for
all analog detectors on a COM loop.
The smoke detector sensor values are presented as obscuration in %
per meter (%/m). (Heat detector values as °C.)
16.3
Decision value
In order to secure real fire alarms and reduce the nuisance alarms, a
decision value is calculated. The decision value is used to decide if it
is normal state, pre-warning, fire alarm or heavy smoke alarm and also
in the smouldering smoke algorithm (see page 94). The decision
value is calculated, see chapter "Filtering algorithm, page 92.
16.4
Alarm algorithms for smoke detectors /
Detection levels / Offsets
Each alarm algorithm has three detection levels:
1.
fire alarm
(fire alarm level = the week average sensor value + the
fire alarm offset)
2.
pre-warning
will be activated (if selected in WinG3 – Control
unit Properties) at a lower level (smaller offset) than for fire
alarm, i.e. pre-warning will be activated before the fire alarm from
the same alarm point.
3.
heavy smoke alarm
will be activated at a higher level (bigger
offset) than for fire alarm, i.e. heavy smoke alarm will be
activated later than the fire alarm from the same alarm point.
